Industrial Compost Mixers from ROTO-MIX are available in four capacities from 16 to 34 cubic yards. The rotary design uses a large-diameter rotor and two side-mounted augers to accomplish a rapid, thorough mix with no tunneling. The rotor lifts material up to the side augers that move material end-to-end. The total movement of material in the mixing chamber eliminates dead spots, helping consistently balance nutrients and microorganisms. It is available in truck, trailer and stationary models. Folding and hydraulic-drive conveyors are available for windrowing or stacking. Also available are stainless steel shells and liners, electronic scales, and enclosed oil-bath drives. 620/225-1142; www.rotomix.com.